*{
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}
body{
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  background: #000;
}
.iconfont.logo{
  position: relative;
  color: #fff;
  font-size: 5em;
  text-shadow: 0 0 50px #0f0,
              0 0 100px #0f0,
              0 0 150px #0f0,
              0 0 200px #0f0,
              0 0 250px #0f0;
  animation: animate 5s linear infinite;
}
@keyframes animate{
  0%{
    filter: hue-rotate(0deg);
  }
  100%{
    filter: hue-rotate(360deg);
  }
}